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• W2149014410 abstract "ABSTRACT NF-κB is an inducible transcription factor mediating innate immune responses whose activity is controlled by the multiprotein IκB kinase (IKK) “signalsome”. The core IKK consists of two catalytic serine kinases, IKKα and IKKβ, and a noncatalytic subunit, IKKγ. IKKγ is required for IKK activity by mediating kinase oligomerization and serving to couple the core catalytic subunits to upstream mitogen-activated protein 3-kinase cascades. We have discovered an alternatively spliced IKKγ mRNA isoform, encoding an in-frame deletion of exon 5, termed IKKγ-Δ. Using a specific reverse transcription-PCR assay, we find that IKKγ-Δ is widely expressed in cultured human cells and normal human tissues. Because IKKγ-Δ protein is lacking a critical coiled-coil domain important in protein-protein interactions, we sought to determine its signaling properties by examining its ability to self associate, couple to activators of the canonical pathway, and mediate human T-cell leukemia virus type 1 (HTLV-1) Tax-induced NF-κB activity. Coimmunoprecipitation and confocal colocalization assays indicate IKKγ-Δ has strong homo- and heterotypic association with wild-type (WT) IKKγ and, like IKKγ WT, associates with the IKKβ kinase. Similarly, IKKγ-Δ mediates IKK kinase activity and downstream NF-κB-dependent transcription in response to tumor necrosis factor (TNF) and the NF-κB-inducing kinase-IKKα signaling pathway. Surprisingly, however, in contrast to IKKγ WT, IKKγ-Δ is not able to mediate HTLV-1 Tax-induced NF-κB-dependent transcription, even though IKKγ-Δ binds and colocalizes with Tax. These observations suggest that IKKγ-Δ is a functionally distinct alternatively spliced mRNA product differentially mediating TNF-induced, but not Tax-induced, signals converging on the IKK signalsome. Differing levels of IKKγ-Δ expression, therefore, may affect signal transduction cascades coupling to IKK." @default.
• W2149014410 created "2016-06-24" @default.
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• W2149014410 date "2006-05-01" @default.
• W2149014410 modified "2023-09-26" @default.
• W2149014410 title "An Alternative Splice Product of IκB Kinase (IKKγ), IKKγ-Δ, DifferentiallyMediates Cytokine and Human T-Cell Leukemia Virus Type 1 Tax-Induced NF-κB Activation" @default.
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• W2149014410 doi "https://doi.org/10.1128/jvi.80.9.4227-4241.2006" @default.
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